Camshaft housing



Aug 28, 1962 A. H. YoRDl 3,051,149

CAMSHAFT HOUSING Filed Jan. 18, 1961 IN V EN TOR.

My/M United States Patent O 3,051,149 CAMSHAFT HOUSING Arthur H. Yordi, 5942 3rd Ave., Kenosha, Wis. Filed Jan. 18, 1961, Ser. No. 83,511 2 Claims. (cl. 12s- 90) This invention relates to a fluid filled enclosure for a camshaft and the like and more particularly to a construction where the camshaft is wholly enclosed in a chamber containing uid under pressure which in turn acts directly on the tappets.

Broadly the invention comprehends the provision of an enclosure, either as a separate :tube or the integral part of a camshaft housing to receive and contain a fluid under pressure, which Wholly surrounds a camshaft and constantly maintains pressure on the tappets to keep the tap-.- pets and cams from galling and avoid and eliminate the usual tappet noise.

Among the objects of this invention is the provision of a pressurized fluid iilled housing to wholly enclose a camshaft whereby such fluid under pressure acts against the tappets to force said tappets away from the cams and which will take up the clearance on the push rods required for valve lash normally associated with the tappets,

Other objects and advantages of this invention will appear from the following description taken in connection Vwith the drawings forming a part of the specication, and in which:

FIGURE 1 is a fragmentary transverse vertical section of a camshaft housing of a V-type internal-combustion engine incorporating the construction of my invention.

FIGURE 2 is a transverse sectional view of the structure of FIGURE 1.

Referring to the drawings for more specific details of the invention, represents generally a camshaft housing provided interiorly with a tubular enclosure or sleeve 11 which completely encloses the camshaft 12. This sleeve 11 may be specially fitted in the housing 10 or may be cast as an integral part of the housing 10. If, as is the case in the present disclosure, the sleeve 11 is a separate part of the housing, the applicant provides a set screw 13, which is threadedly mounted in the housing and the sleeve, to keep the sleeve in correct position in the housing and prevent any shifting on the part of the sleeve.

The ends of the sleeve 11 are closed by a Welch plug 14 at one end and a fiat disk like plate 15 at the other end. Spaced bearing members 16 are positioned within the housing 10 to provide bearing support for the journals 17. The housing has inlet passages 18 which are connected to a by-pass from the oil supply pump, not shown, that is normally used for the main and rod bearing to lubricate the internal combustion engine, generally.

Immediately between the plug and the end of the camshaft 12, the applicant provides a drain passage 24 to eliminate any excess fluid which might escape past the bearing. This eliminates any possibility of pressure against the end of the camshaft.

Another passageway 25 is drilled through the sleeve and is used to permit air to escape which enters, inadvertently, in the camshaft housing. A relief valve 17a is disposed in connection with the passageway 25 lto regulate all escape of air through the passageway 26.

3,651,149 Patented Aug. 28, 1962 Washer 21 and fastening element 22.

Spaced along the camshaft are cams 44 which periodically engage the tappets or valve lifters 14a. These valve lifters in turn, are in combination with the usual push rods 15a.

In operation, the iiuid is constantly contained in the housing, entirely surrounding the camshaft and always completely filling 4the sleeve maintained in said housing. As the fluid is under pressure, such pressure is used to force the tappets away from the cam. The only time Contact is made between the cam and tappet being when in operative position. This uid overcomes the normal downward pressure on the tappets with the fluid pushing the tappet away from the cam.

While this invention has been described in connection with certain specific embodiments, the principle involved is susceptible of numerous applications that will readily occur to persons skilled in the ant. This invention, therefore, is limited only as indicated by the scope of the appended claims.

What I claim is:

1. The combination in a camshaft housing, a tubular enclosure and a camshaft, said enclosure formed within the interior of said housing and enclosing said shaft, tappets spaced along said enclosure and movable vertically through openings in said enclosure, said enclosure filled with fluid under pressure, said fluid exerting constant pressure against said tappets, a passageway drilled through said housing and said enclosure, a relief valve disposed in said passageway, said valve adapted to permit air to escape through said passageway.

2. The combination in a camshaft housing, a sleeve and a camshaft, said sleeve inserted within the interior of said housing, alined threaded openings in said housing and sleeve, a set screw threadedly mounted in said openings and holding said sleeve in position in said housing, tappets spaced along said sleeve and movable vertically through openings in said sleeve, a pump, said pump remote from said sleeve, said pump directing fluid into said sleeve to maintain said sleeve lled with said fluid under pressure, said fluid exerting constant pressure against said tappets, a passageway drilled through said housing and said sleeve, a relief valve disposed in said passageway, said valve adapted to permit air to escape through said passageway.

References Cited in the file of this patent UNITED STATES PATENTS 1,256,242 Marmon Feb. 12, 19'18 1,741,230 Goodwin Dec. 31, 1929 2,685,483 Morra Aug. 3, 1954 FOREIGN PATENTS 196,710 Great Britain s May 2, 1923 

